Answer: It is the principle that matter cannot be created or destroyed.
Explanation:
C) 179 amu. Hf or hafnium is an element having an atomic number of 72. It is a transition metal <span>with at least </span>34 isotopes, five of these stable isotopes have an atomic mass ranging from of 176 amu to 180 amu. Getting the average atomic mass requires knowledge on the % abundance of the stable isotopes, and then getting the weighted average.
WOW, I gave you the answer, i used a periodic table, i got the mass of gold and i linked a helpful link my teacher gave me because we used it in a lab once.
Answer: 0.5 moles
Explanation:
Nitric acid has a chemical formula of HNO3.
Given that:
Amount of moles of HNO3 = Z (let unknown value be Z)
Volume of HNO3 solution = 2L
Molarity of HCl solution = 1M
Recall that molarity of a solution is obtained by dividing the amount of moles by volume in liters
i.e Molarity = Amount in moles/volume
1M = Z x 2L
Z = (1M / 2L)
Z = 0.5 moles
Thus, 0.5 moles of nitric acid are needed to make 2 liters of its solution.